Control system for viewing devices



Au 25, 1931. F. E. WELLER 1,820,516

CONTROL SYSTEM FOR VIEWING DEVICES Filed March 12, 1929 2 Sheets-Sheet l INVENTOR Wad P- A'ITOENEYS Aug. 25, 1931. v F. E. WELLER 1,820,516

CONTROL SYSTEM FOR VIEWING DEVICES Filed March 12, 1929 2 Sheets-Sheet 2 INVENTOR ATTORNEYS Patented Aug. 25, 1931 PATEN OFFICE E. WELLER, OF NEWARK, NEW JERSEY, ASSIGNOR ll'Q TRANS-1113K DAYLIGH'E PICTURE SCREEN CORPORATION, OF NEW YORK, N. Y., A CORPOBATIOE OF UNITED STATES DELAWARE CONTROL SYSTEM FOR VIEWING DEVECES Application filed March 112, 1929. Serial No. 346,474.

My invention relates to a controlsystem for viewing devices particularly such as include a movable tape, web or film bearing information-imparting representations, such as printed matter.

In one of its prominent aspects, my "invention involves a system, vapparatus or mechanism for preventing ignition or combustion of a movable tape, web or film, as aforesaid.

Further objects and advantages of my invention will more fully appear from the following description taken in connection with the accompanying drawings.

My invention resides in the system, apparatus, novel features of construction and combination of parts which are hereinafter shown by way of example in some of their preferred forms.

In the drawings:

Figure l is an end elevational view, with parts omitted, of apparatus constructed in accordance with my invention;

Fig. 2 is a perspective view of ,a control system;

Fig. 3.115 a side elevational view, partly in section, of a preferred form of control system; and

Fig. 4: is an end view, partly in section and partly broken away, of the system shown in Fig. 3.

Referring particularly to Fig. 1, there is illustrated a base member 1 from which vertically extend a plurality of members or standards 2 supporting a table top 3 or the like. Supported by the table top 3 is mechanism, not shown, but of any suitable character for printing information on a paper web or strip W which is periodically moved or actuated in any suitable manner.

After the web of paper leaves the,type wheel, or equivalent,'of the aforesaid printing mechanism, it passes beneath an open frame 4 horizontally disposed and serving to outline the printed portion of the web which is to'be made visible.

Disposed above the frame 4: is an illuminatmg unit U comprising a casin or hous ing 5 having upper and lower openings both in vertical alinement with the frame l and the lower opening being of substantially the same configuration as the opening defined by said frame 4i. Suitably carried by the casing 5 is suitable light producing structure herein shown as a plurality of incandescent lamps L circularly arranged and proj'ecting light on to the surface of the printed web W defined by the frame 4:. From said printed web W, the light is reflected upwardly and passes through a suitable optical system, not shown, but comprising a plurality of lenses disposed in a casing or housing 6. The beam of light emerging from' said optical system may then be reflected and passed to a viewing screen of any suitable character. Y

Extending upwardly from the aforesaid base member 1 is a conduit 7 merging into spaced conduits 'Z'a and 7b which communicate with and form a housing or casing 8 within which the aforesaid casing b is received and which opens downwardly into the lamp casing 5. The latter and the lens casing 8 are supported by the casing 8 which, as stated above, constitutes an en tensionoof the conduits 7a and 7b.

Communicating with the conduit '2', at the lower end thereof, is a drum or casing 9 within which is mounted a tan l0 rotated by the shaft ll of a suitable motive device M herein shown as an electric motor.

With the latter in operation, a cooling gaseous medium, usually ord nary air, 18

tilate the casing 5 and prevent the occurrence therein or at the paper web W of abnormally high temperature such, for example, as might cause ignition or combus tion or said paper web 'W.

Mechanism of the character just described is more specifically disclosed in the pending application of Edward Unkles, Serial No. 325,551, tiled December l2, 1928. lt is with such mechanism, or equivalent, that apparatus constructed in accordance with my invention is adapted to be associated.

in accordance with my invention, an ar rangement is provided for automatically decreasing the temperature which would other wise exist in the aforesaid casing or in proximity to the paper web W should flow of the aforesaid cooling medium cease, either partially or entirely. To this end'and ordi- 5 narily, one or all of the lamps L is or are automatically extinguished in the event that passage of the aforesaid cooling medium through the conduits 7a and 75 becomes abnormal, as aforesaid.

Any suitable form of apparatus may be utilized for performing the purpose stated above. Thus, for example, as illustrated in Fig. 2,"the shaft 11 may have secured thereto centrifugal governor mechanism which,

as well understood, may comprise a collar 12 keyed, or otherwise suitablyiixed, to the shaft 11. Extending from collar 12 are a plurality of resilient members or springs 13 each carrying an inertia member 14:, said 29 springs 13 being secured to a collar 15 freely slidable on said shaft 11. Collar 15 comprises or has secured thereto spaced disks 16 within which is received one end of a member 17 slidable in a slot 18 of a frame. 5 member F. Connected to the arm 17 is one end of a link 19, the other end of which is pivoted to one arm of a bell crank lever 20 pivoted at 21 to the frame member F. Pivoted to the other arm of the bell crank a0 lever 20 is one end of a link 22, adjustable in length if desired, and pivoted at its other end to an armor member 23 pivoted in brackets or arms 24 upstanding from the frame member F. Arm 23 carries suitable clamp structure 25 adapted to embrace or hold a switch member 26;

In the example shown, switch member 26 comprises a glass envelope containing a pool or massof mercury adapted to bridge and electrically connect a set of terminals, terminating interior] of said receptacle, switch members of this character being well known to'the art. Connected, respectively, to these terminals are conductors 27 and 28, the conductor 27 leading and connecting to one terminal of the circuit including the aforesad lamps L; the other conductor 28 leads to one terminal of a suitable source of current, not shown, the other terminal of which is connected, b a conductor 29, to the other terminal of t e aforesaid circuit including the lamps L. Bridged across the supply circuit comprising the conductors 28 and 29 is a circuit utilizable for supplying electrical energy to the aforesaid motive device M, said last named circuit being controlledby a switch 8.

. With the motive device M operating at such s eed that the aforesaid cooling medium .of the web' W, the arrangement of the various arts is such that the 001 of mercury in t e aforesaid lass enve ope bridges the the motive device 'fllllCtlOIlS to prevent ignition or combustion such circumstances, the lamps L are illufor the useful purpose noted above. In event that operation ofthe motive device M should be discontinued or should it operate at greatly reduced speed, supply of the cooling medium to the casing 5 will be entirely or partly discontinued and under such circumstances and as stated above, the temperature in the casing 5 may become so high as to cause ignition of the paper web W. However, should operation of the motive device M thus be partly or entirely discontinued, the disk 16 moves from left to right, Fig. 2, under the influence of the coacting governor mechanism and imparts similar movement to the member 17. As a result, the bell crank lever 20 is swung in a counter-clockwise direction, Fig. 2, to swing the arm 23 andswitch member 26 in a clockwise direction, Fig. 2. Accordingly, the pool of'mercury in said switch member 26 flows, under the influence of gravity, from the terminals of the conductors'27 and 28 to thereby open, the circuit through the lamps L. From the foregoing, it follows that the herein de-' scribed mechanism is automatic in the sense that the services of an attendant are not required for observation of the motive device M. If operation of the latter is partially or entirely suspended, the lamps L are placed in their non-operative condition. In other words, the same agency that causes discontinuance of supply of the cooling medium also functions to render non-operative the" devlces necessitating such cooling medium. Referring to F igs. 1, 3 and 4, there is illustrated -a modified and preferred form of control apparatus constructed in accordance with my invention. As shown, a.sup-' porting member 30 is suitably supported,

or example, by arms 30a secured, respectively, to the casilplg 9 and to the base of ularly in Figs. 3 and 4., a casing or housing 31 is secured to the member 30 by a bracket 32 or the like and another casing or housing 33 is secured endwise to said member 30 by clamps 33a or the like. The member 30 is provided with an opening substantially co- As illustrated particinciding with the opening defined by casin 33. Into these openings, the shaft 11 and governor mechanism 33 extend.

Disposed in the housing 33 is suitable governor mechanism which may be of the character herei-nbefore described in connection with Fig. 2 although, as illustrated, it is positioned on the shaft 11 reversely to the manner in w ich the governor mechanism of Fig. 2 is positioned. Said governor mechanism, in the example shown, comprises a single disk or collar 16 slidable on the shaft 11 and comprising a hub 16a biased from right to left, Fig. 3, by a helical spring 34 hearing against a collar 35 keyed or other- Wise suitably fixed to said shaft 11. Coacting with and movable with disk 16 is a lever 36 passing through slots in the respective housings 33 and 31 and pivoted at 3'? to a standard 38 upstanding in casing 31. The end of lever 36 removed from the disk 16 carries a lateral pin 36a extending through a perforation in a member or bracket 39 pivoted at 40 to the aforesaid standard 38. Depending from the member 39 are a plurality of supporting clamps 41 each comprising spaced resilient arms between which the aforesaid switch member 26 is received. The conductors 27 and 28 leading from the switch member 26 may extend first to a terminal block 42 and then through a conduit 43 alined with a perforation in one wall of the casing 31.

With the motive device M operating at such speed that the cooling medium functions to prevent ignition or combustion of the web IV, the arrangement of the various parts just described is substantially as illustrated in Figs. 1, 3 and 4. That is, the envelope comprised in switch member 26 is inclined and the hub 16a is-in engagement with the collar 35. In this position, the pool of mercury bridges the terminals of conductors 27 and 28 and the lamps L are in operation since the circuit passing therethrough is closed. However, should operation of the motive device M be partly or entirely discontinued, the collar 16 moves from right to left, Fig. 3, and lever 36 is swung clockwise, Fig. 3, about its pivot 37. As a result, the aforesaid envelope is tilted and the pool of mercury, under the influence of gravity, moves from left to right and opens the circuit through the lamps L.

If, for any reason, the governor mechanism should become inoperative such as might be occasioned, for example, by fracture of the springs 13, the spring 34 functions to move the collar 16 from right to left, Fig. 3, to thereby open the circuit through the lamps L. Y

While the invention has been described with respect to certain particular preferred examples which give satisfactory results, it

will be understood by those skilled in the art after understanding the invention, that various changes and modifications may be made without departing-from the spirit and scope of the invention and. it is intended therefore in the appended claims to cover all such changes and modifications.

What is claimed as new anddesired to be secured by Letters Patent'is:

1. In combination, means for supporting a member having information-imparting representations thereon, a source of light coacting with said member to eifect image display of said representations, a circuit for supplying electrical energy to. said source ,ee aie of light, a tiltable mercury switch in said circuit, a motive device comprising a shaft for moving a cooling gaseous medium adja cent said source of light to decrease the temperature at said member, governor mechanism operated by said shaft, a mechanical connection between said governor mechanismand said switch, a housing for said switch, and a housing for said governor mechanism, said connection extending from one housing to the other.

2. In combination, means for supporting a member having information-in'iparting representations thereon, a source of light coacting with said member to effect image display of said representations, a circuit for supplying electrical energy to said source of light, a tiltable gravity control switch in said circuit, a motive device comprising a shaft for moving a cooling gaseous medium adjacent said source of light to decrease the temperature at said member, governor mechanism on said shaft, a member movable along said shaft by said governor mechanism, and a connection between said last named member and said switch for opening and closing the circuit through said switch.

3. In combination, means for supporting a member having information-imparting representations thereon, a source of light coacting with said member to effect image display of said representations, a circuit for supplying electrical energy to said source of light, a tiltable mercury switch in said circuit, a motive device comprising a shaft for moving a cooling gaseous medium adjacent said source of light to decrease the temperature at said member, governor mechanism 011 said shaft, a disk movable along said shaft by said governor mechanism, and a pivoted lever forming a connection between said disk and said switch.

4. In combination, a web movable along a path and bearing information-imparting representations, a source of light coacting with said web to effect the display of said i representations, a circuit for supplying electrical energy to said source of light, a tiltable mercury switch in said circuit, a motive device comprising a shaft for moving a coolin gaseous medium -adjacent said f light to decrease the temperature at said web, governor mechanism on said shaft and comprising a disk movable axially thereof, said governor mechanism comprising inertia-controlled spring members connected to said disk, a spring for biasing said disk in predetermined direction along said shaft, and means connecting said disk to said switch.

In testimony whereof I have signed my name to this specification.

FRANK E. WELLER. 

